/Engine/Source/Runtime/Engine/Classes/GameFramework/Actor.h
Returns true if this actor has been rendered "recently", with a tolerance in seconds to define what "recent" means. e.g.: If a tolerance of 0.1 is used, this function will return true only if the actor was rendered in the last 0.1 seconds of game time.
Whether this actor was recently rendered.
bool WasRecentlyRendered ( float Tolerance ) const